<template>
  <div class="article-container markdown-body">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            src="https://img.yzcdn.cn/vant/cat.jpeg"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
          <van-button
            class="follow-btn"
            round
            size="small"
            v-if="article.is_followed"
            @click="onFollow"
            :loading="isFollowLoading"
          >已关注</van-button>
          <van-button
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            @click="onFollow"
            :loading="isFollowLoading"
          >关注</van-button>

          <follow-user :is_followed="article.is_followed" @update_is_followed="article.is_followed=$event" :user_id="article.aut_id" ></follow-user>

          <follow-user v-model="article.is_followed"  :user_id="article.aut_id" ></follow-user>

        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content" v-html="article.content"></div>
        <van-divider>正文结束</van-divider>
        <article-comment @replay-show="isReplyShow=$event"  :commentList="commentList" :source="article.art_id" @onload-success="totalCount = $event.total_count" />
        <!-- 底部区域 -->
      <div class="article-bottom">
        <van-button
          class="comment-btn"
          type="default"
          round
          size="small"
          @click="isPostShow=true"
        >写评论</van-button>
        <van-icon
          name="comment-o"
          :badge="totalCount"
          color="#777"
        />
        <van-icon
          color="#777"
          name="star-o"
        />
        <van-icon
          color="#777"
          name="good-job-o"
        />
        <van-icon name="share" color="#777777"></van-icon>
      </div>
    <!-- /底部区域 -->

      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

      <!-- 弹出层 -->
    <van-popup
          v-model="isPostShow"
          position="bottom"
        >
      <comment-post @onpost-success="onPostSuccess" ></comment-post>
    </van-popup>

    <van-popup
          v-model="isReplyShow"
          position="bottom"
          :style="{ height: '100%' }"
        >
      123
    </van-popup>
  </div>
</template>

<script>
import CommentPost from './components/comment-post'
import ArticleComment from './components/article-comment'
import FollowUser from '@/components/follow-user'
import { addFollow, deleteFollow } from '@/api/user'
// 把当前文章中所有的img标签的src地址收集到一个数组当中，然后调用一个这个preview插件
import { ImagePreview } from 'vant'
import { getArticleById } from '@/api/article'
import '@/styles/github-markdown.css'
// ImagePreview(['https://img01.yzcdn.cn/vant/apple-1.jpg', 'https://img01.yzcdn.cn/vant/apple-1.jpg', 'https://img01.yzcdn.cn/vant/apple-1.jpg', 'https://img01.yzcdn.cn/vant/apple-1.jpg'])
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    ArticleComment,
    CommentPost
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  data () {
    return {
      loading: true,
      article: {}, // 文章详情
      isFollowLoading: false,
      totalCount: 0,
      isPostShow: false,
      commentList: [],
      isReplyShow: false
    }
  },
  computed: {},
  watch: {},
  created () {
    this.getArticleById()
  },
  mounted () {
  },
  methods: {
    onPostSuccess (newObj) {
      this.isPostShow = false
      this.commentList.unshift(newObj)
    },
    async onFollow () {
      this.isFollowLoading = true
      try {
        // 如果已关注，则取消关注
        const authorId = this.article.aut_id
        if (this.article.is_followed) {
          await deleteFollow(authorId)
        } else {
          // 否则添加关注
          await addFollow(authorId)
        }

        // 更新视图
        this.article.is_followed = !this.article.is_followed
      } catch (err) {
        console.log(err)
        this.$toast.fail('操作失败')
      }
      this.isFollowLoading = false
    },
    async getArticleById () {
      try {
        const res = await getArticleById(this.articleId)
        console.log(res)// json对象
        this.article = res.data.data
        setTimeout(() => {
          var allImg = document.querySelectorAll('.article-content img')
          const images = []
          allImg.forEach(item => {
            images.push(item.src)
            item.onclick = function () {
              ImagePreview(images)
            }
          })
        })
      } catch (err) {
        console.log(err)
      }

      this.loading = false
    }
  }
}
// 在js当中数字有Number,BigInt这二种类型
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
